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Simplifying 154 = -7(2 + 6r) 154 = (2 * -7 + 6r * -7) 154 = (-14 + -42r) Solving 154 = -14 + -42r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '42r' to each side of the equation. 154 + 42r = -14 + -42r + 42r Combine like terms: -42r + 42r = 0 154 + 42r = -14 + 0 154 + 42r = -14 Add '-154' to each side of the equation. 154 + -154 + 42r = -14 + -154 Combine like terms: 154 + -154 = 0 0 + 42r = -14 + -154 42r = -14 + -154 Combine like terms: -14 + -154 = -168 42r = -168 Divide each side by '42'. r = -4 Simplifying r = -4
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